SYS light,, - ZR-1 Net Registry Forums

tomtom72 · 04-17-2010

according to my 90's FSM a 41 = wrong or bad MEMCAL.

tomtom72 · 04-17-2010

I think MEMCAL is FSM-speak for "chip" or EPROM or PROM ( not the senior prom either

)

Toyvet1 · 04-17-2010

It was a C41 code read from grounding the G & A terminals and displayed on the speedo not the SES light is that still the correct reading? I have a FSM but am having a hard time finding the codes in it ...

-=Jeff=- · 04-17-2010

Quote:

Originally Posted by Toyvet1

It was a C41 code read from grounding the G & A terminals and displayed on the speedo not the SES light is that still the correct reading? I have a FSM but am having a hard time finding the codes in it ...

That C41 is for the CCM not ECM.. it is a ECM/CCM COMMs error. either the UART in the CCM is bad, the CCM is bad or one of the other components is bad that connects tot he same Serial bus

EBCM (ABS ECM) AC controller and Radio also connect tot he Serial line

tomtom72 · 04-17-2010

Sorry, my bad

I've never been in the 8D section of my FSM. You should see how clean the pages are. Your page is 8D-47, near the back of the thick book that has "Service Manual" on the cover. It's not the supplement LT5 book or the Electrical Book.

I do not have a scanner on my P/C so I can't send you the pages.

The opening step of the diagnostic chart is not very involved. I can write it in a post if need be?

Tom

Toyvet1 · 04-17-2010

Okay this morning I removed the stereo head unit that was repaired this winter and the sys light is gone. -=jeff=- is going to borrow me a spare and see if that is the problem.

Also am going to try a different ECM to see if that helps the SES light issue.

04-17-2010	#1
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: SYS light,, according to my 90's FSM a 41 = wrong or bad MEMCAL. __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

04-17-2010	#2
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: SYS light,, I think MEMCAL is FSM-speak for "chip" or EPROM or PROM ( not the senior prom either ) __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

04-17-2010	#3
Toyvet1 Join Date: Dec 2007 Location: Bloomingdale, Il Posts: 330	Re: SYS light,, It was a C41 code read from grounding the G & A terminals and displayed on the speedo not the SES light is that still the correct reading? I have a FSM but am having a hard time finding the codes in it ...

04-17-2010	#5
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: SYS light,, Sorry, my bad I've never been in the 8D section of my FSM. You should see how clean the pages are. Your page is 8D-47, near the back of the thick book that has "Service Manual" on the cover. It's not the supplement LT5 book or the Electrical Book. I do not have a scanner on my P/C so I can't send you the pages. The opening step of the diagnostic chart is not very involved. I can write it in a post if need be? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

04-17-2010	#6
Toyvet1 Join Date: Dec 2007 Location: Bloomingdale, Il Posts: 330	Re: SYS light,, Okay this morning I removed the stereo head unit that was repaired this winter and the sys light is gone. -=jeff=- is going to borrow me a spare and see if that is the problem. Also am going to try a different ECM to see if that helps the SES light issue.